I can also confirm this bug on Jaunty 9.04 - Intel Core Duo P9600 with
an Nvidia 9600M (module 180.51)

I've tried noapic, and clocksource=hpet to no avail as well.

Although with clocksource enabled the lock up seemed to stutter for a
second, normally it locks right up with massive artifacts or a complete
white screen. In this case, it seemed the machine started to lock up -
recovered for a second and then completely locked up.

If you need logs or anything else to narrow this down - please don't
hesitate to ask. I'd love to see this get resolved. I can't tell if it's
the Nvidia module or not, I've tried different versions on the module as
well.

-- 
lockups with default (hpet) clocksource on  2.6.27-2-generic 64-bit
https://bugs.launchpad.net/bugs/270798
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